High-speed transmission system for optical channels

a transmission system and optical channel technology, applied in the field of apparatus and methods for high-speed data transmission, can solve problems such as limiting the signaling rate available on the fiber

Active Publication Date: 2011-07-19
AVAGO TECH INT SALES PTE LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At high baud rates some optical fibers may exhibit phenomena such as multimode transmission characteristics and intersymbol interference, which can limit the signaling rate available on that fiber.

Method used

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  • High-speed transmission system for optical channels
  • High-speed transmission system for optical channels
  • High-speed transmission system for optical channels

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Embodiment Construction

[0004]In one aspect of the invention, an apparatus for transmitting data on a fiber optic channel is disclosed. The apparatus comprises a trellis encoder that accepts data to be transmitted, applies a convolutional coding to a portion of the data, and produces a trellis coding of the data to be transmitted. A subset mapper accepts the trellis coding and produces a plurality of pulse amplitude modulated (PAM) symbols from the trellis coding. A Tomlinson precoder accepts the PAM symbols and applies a Tomlinson precoding the PAM symbols. A converter converts the PAM symbols into a form for coupling into a fiber channel.

[0005]In another aspect of the invention an apparatus for receiving data from a fiber optic channel is disclosed. The apparatus comprises an electrical to optical converter that receives an optical signal and converts the optical signal into an analog signal. A decoder accepts the analog signal and converts it into a digital signal. A decoder then accepts and decodes the...

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Abstract

A method and apparatus for transmission of data on bandwidth limited fiber optic channels. A multilevel signaling alphabet having multiple levels of optical intensity are used to transmit signals on optical channels. In order to counteract the decrease in signal to noise ratio resulting from the use of a multilevel signaling alphabet over a bilevel signaling alphabet trellis encoding of the data to be transmitted is employed. To counteract intersymbol interference due to signaling faster than the Nyquist Rate, equalization methods such as Tomlinson-Harashima precoding and decision feedback equalization are employed.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This Application claims priority from Provisional Application No. 60 / 177,034 entitled HIGH SPEED TRANSMISSION FOR OPTICAL CHANNELS filed on Jan. 17, 2000, which is incorporated by reference herein as though set forth in full.FIELD OF THE INVENTION[0002]The present invention relates generally to apparatus and methods for high speed data transmission over optical channels, and, in particular embodiments, to transmission of data using pulse amplitude modulation, trellis coding, and equalization techniques.BACKGROUND OF THE INVENTION[0003]The demand for higher capacity data transmission systems continues to increase. To satisfy the ever increasing demand for more data transmission capacity higher baud rate systems such as optical channels have been used. At high baud rates some optical fibers may exhibit phenomena such as multimode transmission characteristics and intersymbol interference, which can limit the signaling rate available on that ...

Claims

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Application Information

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IPC IPC(8): H04B10/04H03M1/06H03M1/12H04L1/00H04L25/03H04L25/497
CPCH03M1/0604H04L1/0041H04L1/0054H04L1/006H04L25/03146H04L25/03343H04L25/497H04L25/4975H03M1/1215
InventorAGAZZI, OSCAR E.
OwnerAVAGO TECH INT SALES PTE LTD